<template>
  <div class="popup-result">
    <p class="title">最近5次运行时间</p>
    <ul class="popup-result-scroll">
      <template v-if='isShow'>
        <li v-for='item in resultList' :key="item">{{item}}</li>
      </template>
      <li v-else>计算结果中...</li>
    </ul>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        dayRule: '',
        dayRuleSup: '',
        dateArr: [],
        resultList: [],
        isShow: false
      }
    },
    name: 'crontab-result',
    methods: {
      // 表达式值变化时，开始去计算结果
      expressionChange() {

        // 计算开始-隐藏结果
        this.isShow = false;
        // 获取规则数组[0秒、1分、2时、3日、4月、5星期、6年]
        let ruleArr = this.$options.propsData.ex.split(' ');
        // 用于记录进入循环的次数
        let nums = 0;
        // 用于暂时存符号时间规则结果的数组
        let resultArr = [];
        // 获取当前时间精确至[年、月、日、时、分、秒]
        let nTime = new Date();
        let nYear = nTime.getFullYear();
        let nMonth = nTime.getMonth() + 1;
        let nDay = nTime.getDate();
        let nHour = nTime.getHours();
        let nMin = nTime.getMinutes();
        let nSecond = nTime.getSeconds();
        // 根据规则获取到近100年可能年数组、月数组等等
        this.getSecondArr(ruleArr[0]);
        this.getMinArr(ruleArr[1]);
        this.getHourArr(ruleArr[2]);
        this.getDayArr(ruleArr[3]);
        this.getMonthArr(ruleArr[4]);
        this.getWeekArr(ruleArr[5]);
        this.getYearArr(ruleArr[6], nYear);
        // 将获取到的数组赋值-方便使用
        let sDate = this.dateArr[0];
        let mDate = this.dateArr[1];
        let hDate = this.dateArr[2];
        let DDate = this.dateArr[3];
        let MDate = this.dateArr[4];
        let YDate = this.dateArr[5];
        // 获取当前时间在数组中的索引
        let sIdx = this.getIndex(sDate, nSecond);
        let mIdx = this.getIndex(mDate, nMin);
        let hIdx = this.getIndex(hDate, nHour);
        let DIdx = this.getIndex(DDate, nDay);
        let MIdx = this.getIndex(MDate, nMonth);
        let YIdx = this.getIndex(YDate, nYear);
        // 重置月日时分秒的函数(后面用的比较多)
        const resetSecond = function () {
          sIdx = 0;
          nSecond = sDate[sIdx]
        }
        const resetMin = function () {
          mIdx = 0;
          nMin = mDate[mIdx]
          resetSecond();
        }
        const resetHour = function () {
          hIdx = 0;
          nHour = hDate[hIdx]
          resetMin();
        }
        const resetDay = function () {
          DIdx = 0;
          nDay = DDate[DIdx]
          resetHour();
        }
        const resetMonth = function () {
          MIdx = 0;
          nMonth = MDate[MIdx]
          resetDay();
        }
        // 如果当前年份不为数组中当前值
        if (nYear !== YDate[YIdx]) {
          resetMonth();
        }
        // 如果当前月份不为数组中当前值
        if (nMonth !== MDate[MIdx]) {
          resetDay();
        }
        // 如果当前“日”不为数组中当前值
        if (nDay !== DDate[DIdx]) {
          resetHour();
        }
        // 如果当前“时”不为数组中当前值
        if (nHour !== hDate[hIdx]) {
          resetMin();
        }
        // 如果当前“分”不为数组中当前值
        if (nMin !== mDate[mIdx]) {
          resetSecond();
        }

        // 循环年份数组
        goYear: for (let Yi = YIdx; Yi < YDate.length; Yi++) {
          let YY = YDate[Yi];
          // 如果到达最大值时
          if (nMonth > MDate[MDate.length - 1]) {
            resetMonth();
            continue;
          }
          // 循环月份数组
          goMonth: for (let Mi = MIdx; Mi < MDate.length; Mi++) {
            // 赋值、方便后面运算
            let MM = MDate[Mi];
            MM = MM < 10 ? '0' + MM : MM;
            // 如果到达最大值时
            if (nDay > DDate[DDate.length - 1]) {
              resetDay();
              if (Mi == MDate.length - 1) {
                resetMonth();
                continue goYear;
              }
              continue;
            }
            // 循环日期数组
            goDay: for (let Di = DIdx; Di < DDate.length; Di++) {
              // 赋值、方便后面运算
              let DD = DDate[Di];
              let thisDD = DD < 10 ? '0' + DD : DD;

              // 如果到达最大值时
              if (nHour > hDate[hDate.length - 1]) {
                resetHour();
                if (Di == DDate.length - 1) {
                  resetDay();
                  if (Mi == MDate.length - 1) {
                    resetMonth();
                    continue goYear;
                  }
                  continue goMonth;
                }
                continue;
              }

              // 判断日期的合法性，不合法的话也是跳出当前循环
              if (this.checkDate(YY + '-' + MM + '-' + thisDD + ' 00:00:00') !== true && this.dayRule !==
                'workDay' && this.dayRule !== 'lastWeek' && this.dayRule !== 'lastDay') {
                resetDay();
                continue goMonth;
              }
              // 如果日期规则中有值时
              if (this.dayRule == 'lastDay') {
                // 如果不是合法日期则需要将前将日期调到合法日期即月末最后一天

                if (this.checkDate(YY + '-' + MM + '-' + thisDD + ' 00:00:00') !== true) {
                  while (DD > 0 && this.checkDate(YY + '-' + MM + '-' + thisDD + ' 00:00:00') !== true) {
                    DD--;

                    thisDD = DD < 10 ? '0' + DD : DD;
                  }
                }
              } else if (this.dayRule == 'workDay') {
                // 校验并调整如果是2月30号这种日期传进来时需调整至正常月底
                if (this.checkDate(YY + '-' + MM + '-' + thisDD + ' 00:00:00') !== true) {
                  while (DD > 0 && this.checkDate(YY + '-' + MM + '-' + thisDD + ' 00:00:00') !== true) {
                    DD--;
                    thisDD = DD < 10 ? '0' + DD : DD;
                  }
                }
                // 获取达到条件的日期是星期X
                let thisWeek = this.formatDateTime(new Date(YY + '-' + MM + '-' + thisDD + ' 00:00:00'), 'week');
                // 当星期日时
                if (thisWeek == 1) {
                  // 先找下一个日，并判断是否为月底
                  DD++;
                  thisDD = DD < 10 ? '0' + DD : DD;
                  // 判断下一日已经不是合法日期
                  if (this.checkDate(YY + '-' + MM + '-' + thisDD + ' 00:00:00') !== true) {
                    DD -= 3;
                  }
                } else if (thisWeek == 7) {
                  // 当星期6时只需判断不是1号就可进行操作
                  if (this.dayRuleSup !== 1) {
                    DD--;
                  } else {
                    DD += 2;
                  }
                }
              } else if (this.dayRule == 'weekDay') {
                // 如果指定了是星期几
                // 获取当前日期是属于星期几
                let thisWeek = this.formatDateTime(new Date(YY + '-' + MM + '-' + DD + ' 00:00:00'), 'week');
                // 校验当前星期是否在星期池（dayRuleSup）中
                if (this.dayRuleSup.indexOf(thisWeek) < 0) {
                  // 如果到达最大值时
                  if (Di == DDate.length - 1) {
                    resetDay();
                    if (Mi == MDate.length - 1) {
                      resetMonth();
                      continue goYear;
                    }
                    continue goMonth;
                  }
                  continue;
                }
              } else if (this.dayRule == 'assWeek') {
                // 如果指定了是第几周的星期几
                // 获取每月1号是属于星期几
                let thisWeek = this.formatDateTime(new Date(YY + '-' + MM + '-' + DD + ' 00:00:00'), 'week');
                if (this.dayRuleSup[1] >= thisWeek) {
                  DD = (this.dayRuleSup[0] - 1) * 7 + this.dayRuleSup[1] - thisWeek + 1;
                } else {
                  DD = this.dayRuleSup[0] * 7 + this.dayRuleSup[1] - thisWeek + 1;
                }
              } else if (this.dayRule == 'lastWeek') {
                // 如果指定了每月最后一个星期几
                // 校验并调整如果是2月30号这种日期传进来时需调整至正常月底
                if (this.checkDate(YY + '-' + MM + '-' + thisDD + ' 00:00:00') !== true) {
                  while (DD > 0 && this.checkDate(YY + '-' + MM + '-' + thisDD + ' 00:00:00') !== true) {
                    DD--;
                    thisDD = DD < 10 ? '0' + DD : DD;
                  }
                }
                // 获取月末最后一天是星期几
                let thisWeek = this.formatDateTime(new Date(YY + '-' + MM + '-' + thisDD + ' 00:00:00'), 'week');
                // 找到要求中最近的那个星期几
                if (this.dayRuleSup < thisWeek) {
                  DD -= thisWeek - this.dayRuleSup;
                } else if (this.dayRuleSup > thisWeek) {
                  DD -= 7 - (this.dayRuleSup - thisWeek)
                }
              }
              // 判断时间值是否小于10置换成“05”这种格式
              DD = DD < 10 ? '0' + DD : DD;

              // 循环“时”数组
              goHour: for (let hi = hIdx; hi < hDate.length; hi++) {
                let hh = hDate[hi] < 10 ? '0' + hDate[hi] : hDate[hi]

                // 如果到达最大值时
                if (nMin > mDate[mDate.length - 1]) {
                  resetMin();
                  if (hi == hDate.length - 1) {
                    resetHour();
                    if (Di == DDate.length - 1) {
                      resetDay();
                      if (Mi == MDate.length - 1) {
                        resetMonth();
                        continue goYear;
                      }
                      continue goMonth;
                    }
                    continue goDay;
                  }
                  continue;
                }
                // 循环"分"数组
                goMin: for (let mi = mIdx; mi < mDate.length; mi++) {
                  let mm = mDate[mi] < 10 ? '0' + mDate[mi] : mDate[mi];

                  // 如果到达最大值时
                  if (nSecond > sDate[sDate.length - 1]) {
                    resetSecond();
                    if (mi == mDate.length - 1) {
                      resetMin();
                      if (hi == hDate.length - 1) {
                        resetHour();
                        if (Di == DDate.length - 1) {
                          resetDay();
                          if (Mi == MDate.length - 1) {
                            resetMonth();
                            continue goYear;
                          }
                          continue goMonth;
                        }
                        continue goDay;
                      }
                      continue goHour;
                    }
                    continue;
                  }
                  // 循环"秒"数组
                  goSecond: for (let si = sIdx; si <= sDate.length - 1; si++) {
                    let ss = sDate[si] < 10 ? '0' + sDate[si] : sDate[si];
                    // 添加当前时间（时间合法性在日期循环时已经判断）
                    if (MM !== '00' && DD !== '00') {
                      resultArr.push(YY + '-' + MM + '-' + DD + ' ' + hh + ':' + mm + ':' + ss)
                      nums++;
                    }
                    // 如果条数满了就退出循环
                    if (nums == 5) break goYear;
                    // 如果到达最大值时
                    if (si == sDate.length - 1) {
                      resetSecond();
                      if (mi == mDate.length - 1) {
                        resetMin();
                        if (hi == hDate.length - 1) {
                          resetHour();
                          if (Di == DDate.length - 1) {
                            resetDay();
                            if (Mi == MDate.length - 1) {
                              resetMonth();
                              continue goYear;
                            }
                            continue goMonth;
                          }
                          continue goDay;
                        }
                        continue goHour;
                      }
                      continue goMin;
                    }
                  } //goSecond
                } //goMin
              } //goHour
            } //goDay
          } //goMonth
        }
        // 判断100年内的结果条数
        if (resultArr.length == 0) {
          this.resultList = ['没有达到条件的结果！'];
        } else {
          this.resultList = resultArr;
          if (resultArr.length !== 5) {
            this.resultList.push('最近100年内只有上面' + resultArr.length + '条结果！')
          }
        }
        // 计算完成-显示结果
        this.isShow = true;


      },
      // 用于计算某位数字在数组中的索引
      getIndex(arr, value) {
        if (value <= arr[0] || value > arr[arr.length - 1]) {
          return 0;
        } else {
          for (let i = 0; i < arr.length - 1; i++) {
            if (value > arr[i] && value <= arr[i + 1]) {
              return i + 1;
            }
          }
        }
      },
      // 获取"年"数组
      getYearArr(rule, year) {
        this.dateArr[5] = this.getOrderArr(year, year + 100);
        if (rule !== undefined) {
          if (rule.indexOf('-') >= 0) {
            this.dateArr[5] = this.getCycleArr(rule, year + 100, false)
          } else if (rule.indexOf('/') >= 0) {
            this.dateArr[5] = this.getAverageArr(rule, year + 100)
          } else if (rule !== '*') {
            this.dateArr[5] = this.getAssignArr(rule)
          }
        }
      },
      // 获取"月"数组
      getMonthArr(rule) {
        this.dateArr[4] = this.getOrderArr(1, 12);
        if (rule.indexOf('-') >= 0) {
          this.dateArr[4] = this.getCycleArr(rule, 12, false)
        } else if (rule.indexOf('/') >= 0) {
          this.dateArr[4] = this.getAverageArr(rule, 12)
        } else if (rule !== '*') {
          this.dateArr[4] = this.getAssignArr(rule)
        }
      },
      // 获取"日"数组-主要为日期规则
      getWeekArr(rule) {
        // 只有当日期规则的两个值均为“”时则表达日期是有选项的
        if (this.dayRule == '' && this.dayRuleSup == '') {
          if (rule.indexOf('-') >= 0) {
            this.dayRule = 'weekDay';
            this.dayRuleSup = this.getCycleArr(rule, 7, false)
          } else if (rule.indexOf('#') >= 0) {
            this.dayRule = 'assWeek';
            let matchRule = rule.match(/[0-9]{1}/g);
            this.dayRuleSup = [Number(matchRule[1]), Number(matchRule[0])];
            this.dateArr[3] = [1];
            if (this.dayRuleSup[1] == 7) {
              this.dayRuleSup[1] = 0;
            }
          } else if (rule.indexOf('L') >= 0) {
            this.dayRule = 'lastWeek';
            this.dayRuleSup = Number(rule.match(/[0-9]{1,2}/g)[0]);
            this.dateArr[3] = [31];
            if (this.dayRuleSup == 7) {
              this.dayRuleSup = 0;
            }
          } else if (rule !== '*' && rule !== '?') {
            this.dayRule = 'weekDay';
            this.dayRuleSup = this.getAssignArr(rule)
          }
        }
      },
      // 获取"日"数组-少量为日期规则
      getDayArr(rule) {
        this.dateArr[3] = this.getOrderArr(1, 31);
        this.dayRule = '';
        this.dayRuleSup = '';
        if (rule.indexOf('-') >= 0) {
          this.dateArr[3] = this.getCycleArr(rule, 31, false)
          this.dayRuleSup = 'null';
        } else if (rule.indexOf('/') >= 0) {
          this.dateArr[3] = this.getAverageArr(rule, 31)
          this.dayRuleSup = 'null';
        } else if (rule.indexOf('W') >= 0) {
          this.dayRule = 'workDay';
          this.dayRuleSup = Number(rule.match(/[0-9]{1,2}/g)[0]);
          this.dateArr[3] = [this.dayRuleSup];
        } else if (rule.indexOf('L') >= 0) {
          this.dayRule = 'lastDay';
          this.dayRuleSup = 'null';
          this.dateArr[3] = [31];
        } else if (rule !== '*' && rule !== '?') {
          this.dateArr[3] = this.getAssignArr(rule)
          this.dayRuleSup = 'null';
        } else if (rule == '*') {
          this.dayRuleSup = 'null';
        }
      },
      // 获取"时"数组
      getHourArr(rule) {
        this.dateArr[2] = this.getOrderArr(0, 23);
        if (rule.indexOf('-') >= 0) {
          this.dateArr[2] = this.getCycleArr(rule, 24, true)
        } else if (rule.indexOf('/') >= 0) {
          this.dateArr[2] = this.getAverageArr(rule, 23)
        } else if (rule !== '*') {
          this.dateArr[2] = this.getAssignArr(rule)
        }
      },
      // 获取"分"数组
      getMinArr(rule) {
        this.dateArr[1] = this.getOrderArr(0, 59);
        if (rule.indexOf('-') >= 0) {
          this.dateArr[1] = this.getCycleArr(rule, 60, true)
        } else if (rule.indexOf('/') >= 0) {
          this.dateArr[1] = this.getAverageArr(rule, 59)
        } else if (rule !== '*') {
          this.dateArr[1] = this.getAssignArr(rule)
        }
      },
      // 获取"秒"数组
      getSecondArr(rule) {
        this.dateArr[0] = this.getOrderArr(0, 59);
        if (rule.indexOf('-') >= 0) {
          this.dateArr[0] = this.getCycleArr(rule, 60, true)
        } else if (rule.indexOf('/') >= 0) {
          this.dateArr[0] = this.getAverageArr(rule, 59)
        } else if (rule !== '*') {
          this.dateArr[0] = this.getAssignArr(rule)
        }
      },
      // 根据传进来的min-max返回一个顺序的数组
      getOrderArr(min, max) {
        let arr = [];
        for (let i = min; i <= max; i++) {
          arr.push(i);
        }
        return arr;
      },
      // 根据规则中指定的零散值返回一个数组
      getAssignArr(rule) {
        let arr = [];
        let assiginArr = rule.split(',');
        for (let i = 0; i < assiginArr.length; i++) {
          arr[i] = Number(assiginArr[i])
        }
        arr.sort(this.compare)
        return arr;
      },
      // 根据一定算术规则计算返回一个数组
      getAverageArr(rule, limit) {
        let arr = [];
        let agArr = rule.split('/');
        let min = Number(agArr[0]);
        let step = Number(agArr[1]);
        while (min <= limit) {
          arr.push(min);
          min += step;
        }
        return arr;
      },
      // 根据规则返回一个具有周期性的数组
      getCycleArr(rule, limit, status) {
        // status--表示是否从0开始（则从1开始）
        let arr = [];
        let cycleArr = rule.split('-');
        let min = Number(cycleArr[0]);
        let max = Number(cycleArr[1]);
        if (min > max) {
          max += limit;
        }
        for (let i = min; i <= max; i++) {
          let add = 0;
          if (status == false && i % limit == 0) {
            add = limit;
          }
          arr.push(Math.round(i % limit + add))
        }
        arr.sort(this.compare)
        return arr;
      },
      // 比较数字大小（用于Array.sort）
      compare(value1, value2) {
        if (value2 - value1 > 0) {
          return -1;
        } else {
          return 1;
        }
      },
      // 格式化日期格式如：2017-9-19 18:04:33
      formatDateTime(value, type) {
        // 计算日期相关值
        let time = typeof value == 'number' ? new Date(value) : value;
        let Y = time.getFullYear();
        let M = time.getMonth() + 1;
        let D = time.getDate();
        let h = time.getHours();
        let m = time.getMinutes();
        let s = time.getSeconds();
        let week = time.getDay();
        // 如果传递了type的话
        if (type == undefined) {
          return Y + '-' + (M < 10 ? '0' + M : M) + '-' + (D < 10 ? '0' + D : D) + ' ' + (h < 10 ? '0' + h : h) + ':' +
            (m < 10 ? '0' + m : m) + ':' + (s < 10 ? '0' + s : s);
        } else if (type == 'week') {
          // 在quartz中 1为星期日
          return week + 1;
        }
      },
      // 检查日期是否存在
      checkDate(value) {
        let time = new Date(value);
        let format = this.formatDateTime(time)
        return value === format;
      }
    },
    watch: {
      'ex': 'expressionChange'
    },
    props: ['ex'],
    mounted: function () {
      // 初始化 获取一次结果
      this.expressionChange();
    }
  }

</script>
